Dumping unit for trucks



July 7, 1931. T. H. CLARK DUMPING UNIT FOR 'rnucxs' Filed Jan. 29, 1930 2 Sheets-Sheet l July 7, 1931. T. H. CLARK DUMPING UNIT FOR TRUCKS Filed Jan. 29, 1930 2 Sheets-Sheet 2 H Clark Patented July 7, 1931 WHOM-AS HERBERT on M-AnromoHIo, nssreivon ro THEQMABION STEEL a'omr coMPANioF MARION, onro nodnronnrxoivjor .0319

nUMPiNe 11 mm rose 'irnuoxs Application fildJ'anuary 529.1980. fSerialfNo.- 424,371. Y i

This inventionseeks to provide a simple, compact, inexpensive rand eificient mechanism whereby a: dumping .bodyunay be raised and .loweredvand will be firmly supported '5 when not in thedumping position. Theiny'ention. also seeksto provide-a dumping unit which maybe readily aappliedto any standard dumping truck ihassis. The invent on 'iszillustrated zinfthe accompanying drawings m and will :be hereinafter :first fully described and then more particularly defined in the ann n e lei ln the drawings: I V I *Figure l'is a side elevation, with parts brdk'e i a a ipartsin ct n,

much of a d unpingtruok as-isjneeessary to anlnnderstanding of my invention,

:1 ig 2 is ahorizontal; section .on the line 2 f Fig. I,

3,is a: detail section .on the 1ine'3 3 wi -=2 a 5 F 1g. A is a .detail section. onithe line p g? Z 1' v v.'1-het1;uckQchassis, indicated at 1, maybe fyepprw men o an rconstructiom 1 rryns out t Pre ent nvem tion, there are ,providedside members or sills 2, which ar e strong wooden ;timbers and are adapted to rest 2 upon the :side 'barsiof the 30 chassis, asshown in Fig. '1. The rear upper 0 thebearns and-hasits endsseeured to black ets6 which are-alsosecured tothe outer-sides of the-beams, as ,clearly shown in; Fig. 2. The gbrackets 6 have openings ,formed therethrough to accommodate a ,tu-lcrum ,-1;0d -7 which extends across the entire width of the dumping-unit and is received at its ends in bosses 8 on the outer sides of -tuilcnum brackets 9 Which-extend supwardly fnom thehrac'kefis 1 6 d re; esame ot e ou sides 20$ 25 rails or angle bars 10 which, in turn, are

ifirmly secured to the-bottoinof the :body 4 The body 4 may beef-any: desired detailed design and dimensions Iand is proyided adj acent its front end with transverse :props or grests llfWlllCllare; adapted to rest upon .the upper --sides 0f athe Side bars 2, as shown. The bracket 9 constitute 1 rockers which may swing about .the i rlcrum od 7 i and ally:QPP=I"OLV(1:111QQI1$fifOIY jreventinglateralmovement .of themocking rackets; along the f llcrumerodamay be emfployed,';th e drawings illustrating ,cottervpinsfl-as a Inatterof convenience. 7 .;Near itheir front: ends, the side bars orJoeamsQ haye not'ches, indicated at 12,

ttorn editransverisely'in their upper edges; arid clipsor U bolts 113, areseatfed in said, notches to 1 span -the respective Side-$13319 and extend down atopoints below-the sills-of thechassis, as will be -understood clip plate/s14 being fittedupon (the ,Llsboltsbelow the sill's 1 and nuts l 5 being mounted uponzthe. extremities I of the bolts :to; Joe turned home, against :said

clip .plates wherebythe beams may be readily and .firmlygseeured upon-the;si1ls. Secured I to f'thQ ORtGI asides of the respective beams 2 adj acent; the U.-bolts 13 are plates 16 which projeet above-the beams andhave their outer edges turned. slightly ioutward whereby .the

plates iserye-as reinforcements :for the beams and-also-guidethe dumping body-intofproper position (over the beams. as alt. sisolowered aftenga dumping" operation. 7 i g securred togrthe inner sides of thebeamsQ, between the ends; of the, same, :are anglebars 17 which have their; hori'zontalwebs disposed along their upper' edgesa-nd' projecting in wardly withrespecttothe beams. :Securedtt'o and upon' thefront' ends :of :thesessidei'angle bars :Lnis :atransyerse angle bar '18 vwhich -9 rves, toiresisti spreading ofethe'side nembers of the runitqa n d. aalsoweonstitntes :a support for ;the front end :of the cylinder 19 which forms a part of the operating'mecha'nism;

Extending t1: a-nsyerse lythrough the :r' eannids of the side angle bars :LT and through the heamsQ; iSEZL shaft-crowed 20:upon whichithe rear'enfd ofithe cylinder "19ris'su ported. To 101 11 the :rear "end ofithe cylin erizupon the shaft and isformed with a half bearing or seat 22 in its upper edge within which the end of the cylinder rests, a clamping band 23 being fitted over the cylinder to mate with the seat 22, as shown clearly in Fig. 3, and securing bolts 24 being fitted through mating lugs on the seat and the band whereby to firmly secure the clamping band over the cylinder. Mounted upon the rod or shaft 20 adjacent and at the sides of the cylinder are segments 25 which form supports and guides for chains 26, each segment having asingle tooth, indicated at 27, between its ends upon its arcuate edge adapted to engage links of the chain 26 and thereby center the chain upon the segments during the operation of the apparatus. Each chain at one end is connected to a crank 28, which is fitted upon the shaft or rod 20 alongside a segment 25,and at the opposlte end is secured to a crosshead 29 which is carried by the rear end of a piston rod 30 extendlng through the rear head of the cylinder 19 and fixed to a piston 31 slidably mounted within the cylinder. The crosshead 29 is entirely free of all parts except the piston rod and the chains and is, therefore, permitted to rock in a transverse vertical plane and accommodate possible variations in the movement of the respective chains as the dumping body is raised or lowered. To the free end of each crank 28 are pivoted the lower ends of links 32 which have their upper ends pivoted to the side rails 10 which are secured to and extend longitudinally of the dumping body. If the piston 31 be driven rearwardly, the motion of the same will be transmitted through the piston rod to the crosshead and thence to the chains 26 so that the segments 25 which rock about the shaft or rod 20 and the cranks 28 will be swung upwardly, as will be understood upon reference to the dotted lines in Fig. 1. When the cranks 28 swing upwardly, the links 32, of course, are moved upwardly and the dumping body is lifted so that it rocks about the fulcrum rod 7 as a' pivotal center. The load will, consequently, be discharged from the body and if the force moving the piston be removed the weight of the body will act by gravity to effect a return movement of all the parts and set the body to receive another load. It will be readily noted that the parts are so disposed that a dead center cannot occur, the segments 25 serving to maintain the chains in a properly curved line so that their end links will be in the proper angular relation to the crosshead and the cranks respectively to respond to the movement of one and impart movement to the other without any tendency to bind or pull either out of proper position.

The piston 31 is operated by fluid pressure and to that end a pump, indicated at 33, is disposed below the front end of the cylinder and is connected with the front end thereof through a pipe 34 which provides for a flow of oil or other fluid from the pump to the front end of the cylinder to act upon the piston and drive the same rearwardly. The outlet from the cylinder is disposed near but in advance of the rear end thereof and is connected by a pipe 35 with the casing of the pump so that, when the pump is operating, a circulation of fluid from the rear end of the cylinder to the front end of the same through the pipe 35, the pump and the pipe 34 will be set up. The pump is supported from the cross bar 18 by a U-shaped hanger 36 having its ends secured rigidly to the cross bar, as shown in Fig.4, and passing under the pump casing so as to support the same. The pump is preferably a well known gear pump and is operated through a shaft 37 extending to the motor of the vehicle which is not shown in the drawings as, in itself, it forms no part of the present invention. The pump is also equipped with a choke valve controlled through a rod or other device, indicated at 38, and extending to the front of the vehicle where it may be easily manipulated by the operator. WVhen the pump is operating, the oil or other fluid will be forced into the cylinder and accumulate in front of and bear upon the piston so that the latter will be forced rearwardly to actuate the connections with the dumping body, as previously described. If it be desired to hold the dumping body in the raised position, the choke valve is closed so that the liquid cannot set up a return flow from the cylinder but will be held therein and as it is of some non-compressible fluid the dumping body will be firmly supported l and held in the dumping position. When the dumping body is fully raised, the piston will be driven beyond the outlet port of the cylinder and if the pump then continues to operate it will effect a continuous circulation 1 g of the fluid but will not have any effect upon the piston and raising mechanism, except that the pressure exerted on the piston will be constant and will prevent its return. If the operation of the pump should cease with the choke valve open, the weight of the dumping body will, of course, return it to its lower carrymg position, as previously stated and as will be understood.

The front end of the cylinder is supported firmly upon the cross bar 18 and the front head 39 is in the form of a plug fitting within the end of the cylinder and welded thereto so that it will have ample strength to resist the pressure to which it is subjected in use. The head is formed integral with a bracket 40 having lateral wings which bear against the vertical web of the cross bar 18 and are bolted thereto, as shown in the drawings. The cylinder is thus very firmly supported so that it will remain in its proper operative position and the piston may move readily without binding at all times.

From the foregoing description, taken in connection with the accompanying drawings, it will be seen that I have provided an exceedingly simple, compact and eilicient mechanism whereby a dumping body may be readily operated. The units comprising the side bars or beams 2 and the parts connected therewith obviously may be assembled independently of the truck chassis and may be built upon plans which are drawn in conformity to the particular chassis upon which any given unit is to be mounted. The weight of the unit will, hold it firmly upon the chassis so that fasteners other than the clips 13 will ordinarily be unnecessary but, if desired, the cross bar 5 may be connected to the sills of the chassis either directly or through intermediate brackets. By utilizing continuous beams 2 of wood, I provide a substantial elongated support for the sides of the truck body and all tendency of the body to sag between its ends under load is overcome, this sagging or binding of the dumping bodies'intermediate their ends being a serious objection tomany, if not all, of the dumping trucks now in use.-

Having thus described the invention, I claim:

1. A dumping unit for vehicles compris-' ing a pair of beams, a dumping body mount- 7 ed upon the beams for rocking movement about the rear ends of the same in a vertical plane, a cross bar connected with and disposed between the beams in advance of the rear ends thereof, a cylinder secured at its front end upon said cross bar, a transverse rod mounted fixedly in the beams at the rear of said cross bar and below the cylinder, a sleeve engaged about said rod and supporting the rear end of the cylinder, a piston mounted in the cylinder, means for operating the piston by fluid pressure, cranks mounted upon the fixed transverse rod to turn thereon at the sides of the cylinder, links connecting the respective cranks with the dumping body,

acrosshead connected with the piston at the rear of the-cylinder and above said rod, segments mounted on the fixed transverse rod at the sides of and connected with the cranks, and flexible connections between the crosshead and the cranks, said connections passing I 2. A dumping unit for vehicles comprising I a frame including a transverse angle bar, a dumping body mounted for rocking movement about the rear end of the frame in a vertical plane, a cylinder, a head welded to the front end of the cylinderand having a bracket disposed against and secured to the cross bar, of the frame, a transverse rod secured rigidly in the frame below the rear end of the cylinder, a sleeve fitted on said rod and having a seat in which the rear end of the cylinder rests, a clamping band passing over the cylinder and mating with and secured to said sleeve, rocking segments mounted upon the rod at'the sides of the chains connected thereto, and links connect- 7 ing the cranks with the dumping body.

In testimony whereof I aflix my signature. THOMAS HERBERT CLARK. [L. 5.] 

